<template>
  <div class="article">
    <!-- 顶部导航 -->
    <van-nav-bar left-arrow @click-left="$router.back()" fixed>
      <template #title>
        <div class="nav-author" v-show="showAuthor">
          <van-image round width="7vw" height="7vw" :src="article.aut_photo" />
          <span class="name">{{ article.aut_name }}</span>
          <span class="line">|</span>
          <span class="follow" :class="{un:article.is_followed}" @click="fllowAuthor">{{article.is_followed?'取消关注':"关注"}}</span>
        </div>
      </template>
      <template #right>
        <van-icon name="ellipsis" size="5.4vw"></van-icon>
      </template>
    </van-nav-bar>
    <!-- 内容体 -->
     <!-- 骨架组件 -->
    <div v-if="loading" class="article-skeleton">
      <van-skeleton title :row="12" />
    </div>
    <!-- 文章主体 -->
    <div v-else class="article-wrapper" @scroll="scrollScreen" ref="wrapper">
      <!-- 头部：标题 时间 作者 -->
      <div class="header" ref="header">
        <h3 class="title">{{ article.title }}</h3>
        <div class="time">
          <span>{{ article.pubdate }}</span>
          <span>|</span>
          <span>{{ article.read_count }} 阅读</span>
          <span>|</span>
          <span>{{ article.comm_count }} 评论</span>
        </div>
        <div class="author van-hairline--bottom">
          <van-image
            round
            width="10vw"
            height="10vw"
            :src="article.aut_photo"
          />
          <span class="name">{{ article.aut_name }}</span>
          <van-button @click="fllowAuthor" round size="small" color="#FC6627">+ {{article.is_followed?'取消关注':"关注"}}</van-button>
        </div>
      </div>
      <!-- 内容：文章内容 -->
      <div class="main" ref="main">
        <div class="html" v-html="article.content" v-highlight></div>
        <div class="space"></div>
      </div>
      <!-- 评论：评论组件 -->
      <article-comment  @click-scroll="scrollToCommentOrTop" :article="article"></article-comment>
    </div>
  </div>
</template>
<script>
import { getArticleDetail, fllowAuthor } from '@/api/article'
import articleComment from './components/article-comment.vue'
export default {
  components: {
    articleComment
  },
  data () {
    return {
      article: {},
      showAuthor: false,
      loading: false,
      isToComment: false
    }
  },
  methods: {
    scrollToCommentOrTop () {
      if (!this.isToComment) {
        // 去评论区
        this.$refs.wrapper.scrollTop = this.$refs.header.offsetHeight + this.$refs.main.offsetHeight
      } else {
        // 去顶部
        this.$refs.wrapper.scrollTop = 0
      }

      this.isToComment = !this.isToComment
    },
    //   关注或者取消关注
    async fllowAuthor () {
      await fllowAuthor(this.article.aut_id, !this.article.is_followed)
      //   按照正确结果
      this.article.is_followed = !this.article.is_followed
      this.$toast(this.article.is_followed ? '关注成功' : '取消关注成功')
    },
    scrollScreen () {
    //   console.log(this.$refs.wrapper.scrollTop)
    //   console.log(this.$refs.header.offsetHeight)
    //   if (this.$refs.wrapper.scrollTop > this.$refs.header.offsetHeight) {
    //     this.showAuthor = true
    //   } else {
    //     this.showAuthor = false
    //   }
      this.showAuthor = this.$refs.wrapper.scrollTop > this.$refs.header.offsetHeight
    }
  },
  async created () {
    this.loading = true
    const [err, data] = await getArticleDetail(this.$route.query.id)
    if (err) return this.$toast.fail(err)
    console.log(data)
    this.article = data.data.data

    this.loading = false
  }
}
</script>
<style scoped lang="less">
.article {
    height: 100%;
}
.article-wrapper {
  height: 100%;
  overflow-y: auto;
  padding: 44px 0 50px;
  // 头部
  .header {
    padding: 0 16px;
    .title {
      font-size: 20px;
      font-weight: normal;
      padding: 10px 0;
      margin: 0;
    }
    .time {
      font-size: 12px;
      color: #999;
      span:nth-child(2n) {
        margin: 0 5px;
        color: #ccc;
        position: relative;
        top: -1px;
      }
    }
    .author {
      display: flex;
      align-items: center;
      padding: 10px 0;
      .name {
        flex: 1;
        padding-left: 10px;
        font-size: 16px;
      }
    }
  }
  // 内容
  .main {
    .space {
      height: 16px;
      background: @geek-gray-color;
    }
    .html {
      word-break: break-all;
      width: 100%;
      overflow: hidden;
      padding: 20px 16px;
      /deep/ img {
        max-width: 100%;
        background: #f9f9f9;
      }
      /deep/ pre {
        white-space: pre-wrap;
        code {
          white-space: pre;
        }
      }
    }
  }
}

/deep/ .van-nav-bar__title {
   max-width: 270px;
   width: 270px;
}
.nav-author {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  > span {
    font-size: 14px;
    padding-left: 5px;
  }
  .line {
    color: #ccc;
    position: relative;
    top: -1px;
  }
  .follow {
    color: @geek-color;
    &.un {
        color: #999;
    }
  }
}
</style>
